378 EEPOKT OF COMMISSIO^'ER OF FISH AND FISHERIES. 



of operculum audtbo auterior pairs are ciliated in the young- of all tbree 

 families, but tbis eiliatiou, as well as tbat ou tbe uropods, may be lost 

 in tbe sedeutary adults of tbe Cymothoidw. lu all our species tbe dorsal 

 surface is smootb tbrougbout, or minutely punctate under a lens, but 

 destitute of distinct rougbness, tuberculation or sculpture, except tbat 

 tbe telson may be laintly grooved or sculptured, and in some foreign 

 species more distinctly so. 



Cirolaua Leach. 



Cirolana Leach. Diet, ties Sci. nat., tome sii, p. 347, 1S18. 



Tboracic segments subequal; eyes small, well separated; mandibles 



armed with strong acute teetb; dactyli straight, or but slightly curved; 



l^leon of six distinct segments; basal segment of uropods with tbe inner 



angle i»roduced. 



Two closely allied species are found on tbis coast, which I formerly 

 referred to tbe genus Conilera Leach. Further consideration induces 

 me to refer them rather to tbe present genus, although they have some 

 features which point toward ConiJcm, and are perhaps between that 

 genus and tbe typical forms of Cirolana. From Conilera^ as described 

 by Bate and Westwood, our species difler principally in the more 

 robust four posterior pairs of legs, in tbe produced angle of tbe basal 

 segment of tbe uropods, and in tbe structiu-e of the first pair of pleopods, 

 which are not operculiform either in size or texture. Of these two 

 species one is abundant and is described at length. Tbe description 

 will, however, apj^ly almost equally well to the other except in tbe few 

 points mentioned in tbe appropriate place. Tbe characters given, 

 though slight, appear to be constant, and I have therefore retained tbe 

 two specific names. 



Tbis genus difiers irovaJEga in the structure of the legs, and was placed 

 by Professor Dana in a separate subfamily. In Cirolana tbe first tbree 

 pairs of legs are strong, and armed with minute spine-like claws at tbe 

 tip of tbe nearly straight dactyli ; tbe propodi in these legs are robust, 

 spiny, and somewhat curved, and some of tbe preceding segments are 

 also armed with spines. These legs thus form powerful organs for seiz- 

 ing lining prey, and are not, as in tbe Cymothoi(l(c, and, in a less degree, 

 in ^ga, merely fitted by their curved dactyli to retain tbe bold of the 

 animal upon its host in a jiarasitic existence. The last four pairs of 

 legs are well ciliated and capable of use either for walking or swim- 

 ming, and these animals are thus fitted for their active and predaceous 

 life. 



Cirolana concharum Harger (Srimpsou). 



JE<ja concharum Stimpsou, Mar. Inr. G. Manan, p. 40, 1S53. 



Liitken, Yidensk. Meddel. , 1859, p. 77, 1860. 

 Conilera concharum Harger, This Report, part i, p. 572 (278), 1874. 



Yerrill, This Report, part i, p. 459 (1C5), 1874. 

 Cirolana concharum Harger, Proc. U. S. Xat. Mas., 1*79, voL ii, p. 101, 1879. 



